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path: root/drivers/tty/serial/mfd.c
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Diffstat (limited to 'drivers/tty/serial/mfd.c')
-rw-r--r--drivers/tty/serial/mfd.c73
1 files changed, 15 insertions, 58 deletions
diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c
index d40010a22ecd..c111f36f5d21 100644
--- a/drivers/tty/serial/mfd.c
+++ b/drivers/tty/serial/mfd.c
@@ -16,9 +16,7 @@
* 2/3 chan to port 1, 4/5 chan to port 3. Even number chans
* are used for RX, odd chans for TX
*
- * 2. In A0 stepping, UART will not support TX half empty flag
- *
- * 3. The RI/DSR/DCD/DTR are not pinned out, DCD & DSR are always
+ * 2. The RI/DSR/DCD/DTR are not pinned out, DCD & DSR are always
* asserted, only when the HW is reset the DDCD and DDSR will
* be triggered
*/
@@ -41,8 +39,6 @@
#include <linux/io.h>
#include <linux/debugfs.h>
-#define MFD_HSU_A0_STEPPING 1
-
#define HSU_DMA_BUF_SIZE 2048
#define chan_readl(chan, offset) readl(chan->reg + offset)
@@ -51,7 +47,10 @@
#define mfd_readl(obj, offset) readl(obj->reg + offset)
#define mfd_writel(obj, offset, val) writel(val, obj->reg + offset)
-#define HSU_DMA_TIMEOUT_CHECK_FREQ (HZ/10)
+static int hsu_dma_enable;
+module_param(hsu_dma_enable, int, 0);
+MODULE_PARM_DESC(hsu_dma_enable, "It is a bitmap to set working mode, if \
+bit[x] is 1, then port[x] will work in DMA mode, otherwise in PIO mode.");
struct hsu_dma_buffer {
u8 *buf;
@@ -65,7 +64,6 @@ struct hsu_dma_chan {
enum dma_data_direction dirt;
struct uart_hsu_port *uport;
void __iomem *reg;
- struct timer_list rx_timer; /* only needed by RX channel */
};
struct uart_hsu_port {
@@ -355,8 +353,6 @@ void hsu_dma_start_rx_chan(struct hsu_dma_chan *rxc, struct hsu_dma_buffer *dbuf
| (0x1 << 24) /* timeout bit, see HSU Errata 1 */
);
chan_writel(rxc, HSU_CH_CR, 0x3);
-
- mod_timer(&rxc->rx_timer, jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ);
}
/* Protected by spin_lock_irqsave(port->lock) */
@@ -420,7 +416,6 @@ void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
chan_writel(chan, HSU_CH_CR, 0x3);
return;
}
- del_timer(&chan->rx_timer);
dma_sync_single_for_cpu(port->dev, dbuf->dma_addr,
dbuf->dma_size, DMA_FROM_DEVICE);
@@ -448,8 +443,6 @@ void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
tty_flip_buffer_push(tty);
chan_writel(chan, HSU_CH_CR, 0x3);
- chan->rx_timer.expires = jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ;
- add_timer(&chan->rx_timer);
}
@@ -551,16 +544,9 @@ static void transmit_chars(struct uart_hsu_port *up)
return;
}
-#ifndef MFD_HSU_A0_STEPPING
+ /* The IRQ is for TX FIFO half-empty */
count = up->port.fifosize / 2;
-#else
- /*
- * A0 only supports fully empty IRQ, and the first char written
- * into it won't clear the EMPT bit, so we may need be cautious
- * by useing a shorter buffer
- */
- count = up->port.fifosize - 4;
-#endif
+
do {
serial_out(up, UART_TX, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
@@ -769,9 +755,8 @@ static void serial_hsu_break_ctl(struct uart_port *port, int break_state)
/*
* What special to do:
* 1. chose the 64B fifo mode
- * 2. make sure not to select half empty mode for A0 stepping
- * 3. start dma or pio depends on configuration
- * 4. we only allocate dma memory when needed
+ * 2. start dma or pio depends on configuration
+ * 3. we only allocate dma memory when needed
*/
static int serial_hsu_startup(struct uart_port *port)
{
@@ -870,8 +855,6 @@ static void serial_hsu_shutdown(struct uart_port *port)
container_of(port, struct uart_hsu_port, port);
unsigned long flags;
- del_timer_sync(&up->rxc->rx_timer);
-
/* Disable interrupts from this port */
up->ier = 0;
serial_out(up, UART_IER, 0);
@@ -977,10 +960,6 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_32B;
fcr |= UART_FCR_HSU_64B_FIFO;
-#ifdef MFD_HSU_A0_STEPPING
- /* A0 doesn't support half empty IRQ */
- fcr |= UART_FCR_FULL_EMPT_TXI;
-#endif
/*
* Ok, we're now changing the port state. Do it with
@@ -1343,28 +1322,6 @@ err_disable:
return ret;
}
-static void hsu_dma_rx_timeout(unsigned long data)
-{
- struct hsu_dma_chan *chan = (void *)data;
- struct uart_hsu_port *up = chan->uport;
- struct hsu_dma_buffer *dbuf = &up->rxbuf;
- int count = 0;
- unsigned long flags;
-
- spin_lock_irqsave(&up->port.lock, flags);
-
- count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr;
-
- if (!count) {
- mod_timer(&chan->rx_timer, jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ);
- goto exit;
- }
-
- hsu_dma_rx(up, 0);
-exit:
- spin_unlock_irqrestore(&up->port.lock, flags);
-}
-
static void hsu_global_init(void)
{
struct hsu_port *hsu;
@@ -1415,6 +1372,12 @@ static void hsu_global_init(void)
serial_hsu_ports[i] = uport;
uport->index = i;
+
+ if (hsu_dma_enable & (1<<i))
+ uport->use_dma = 1;
+ else
+ uport->use_dma = 0;
+
uport++;
}
@@ -1427,12 +1390,6 @@ static void hsu_global_init(void)
dchan->reg = hsu->reg + HSU_DMA_CHANS_REG_OFFSET +
i * HSU_DMA_CHANS_REG_LENGTH;
- /* Work around for RX */
- if (dchan->dirt == DMA_FROM_DEVICE) {
- init_timer(&dchan->rx_timer);
- dchan->rx_timer.function = hsu_dma_rx_timeout;
- dchan->rx_timer.data = (unsigned long)dchan;
- }
dchan++;
}